#include <stdio.h>
#include <unistd.h>

int main()
{
    pid_t id = fork();

    if(id < 0)
    {
        //创建失败
        perror("fork");
        return 1;
    }
    else if(id == 0)
    {
        //child process
        while(1)
        {
        printf("i am child pid:%d ppid:%d\n",getpid(),getppid());
        sleep(1);
         }
    }

    else
    {
        //parent child
        while(1)
        {
        printf("i am parent pid:%d ppid:%d\n",getpid(),getppid());
        sleep(1);
        }
    }
    printf("you can see me\n");
    sleep(1);

    return 0;
}

